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USB to RS232/RS485 Converter (3KV isolation/6KV lightning protection)

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Type : USB to RS485/RS232 Converter
Description :

The device provides the basic functionality of a USB to RS232/RS485 interface with 3KV isolation and 6KV lightning protection (RS232, RS485 cannot be used simultaneously).


The device provides the basic functionality of a USB to RS232/RS485 interface with 3KV isolation and 6KV lightning protection (RS232, RS485 cannot be used simultaneously). It is powered by a USB port, eliminating the need for an external power supply. It employs a unique zero-delay automatic transmission and reception conversion technology, making it plug-and-play compatible with any software. It also features transmit/receive enable control, where the output remains in a high-impedance state during standby mode when no data is being transmitted. The device supports multi-point communication.


Distinguishing itself from other low-cost products on the market, this product offers the following features:

Industrial-grade operating temperature range (-40℃ ~ +85℃).

Serial interface with 3KV isolation (protecting the USB port from AC~380V input) and 6KV three-level lightning protection (10/700us current wave, internal resistance of 40Ω).

Gold-plated USB port with built-in TVS protection (±15kV air discharge and ±8kV contact discharge).

Equipped with isolated 5V power output (2W).

Includes three LED indicators: Power (red), Serial Data Receive (orange), and Serial Data Transmit (green).


The device features a full-speed USB interface, compatible with USB v2.0.

It emulates a standard serial port, allowing for the upgrade of existing peripheral devices or the addition of extra serial ports via USB.

The serial port applications on Windows operating systems are fully compatible without any modifications required.

The hardware includes built-in transmit/receive buffers. The RS485 interface supports communication baud rates from 50bps to 2Mbps, while the RS232 interface supports communication baud rates from 50bps to 256kbps.

The device automatically selects between RS232 and RS485 interfaces upon connection (cannot be used simultaneously).

It is compatible with operating systems such as Win98/2K/XP, WIN10/WIN11 (32/64-bit), Linux, MAC OS-9/X, and Android.

The RS485 communication line requires shielded twisted pair cables with a minimum cross-sectional area of 0.5mm copper, supporting maximum communication distances of 3000 meters (4800bps), 2000 meters (9600bps), and 1000 meters (115.2Kbps).

The minimum number of networked sites is 128, and the maximum number is determined by the RS485 input impedance of each site.

It features three LED indicators: power (red), serial data receive (orange), and serial data transmit (green) for convenient status monitoring.

The USB port is gold-plated, and the device is powered via USB. The operating current is less than 30mA. The USB interface provides protection against electrostatic discharge up to ±15kV (air) and ±8kV (contact), EFT protection up to 40A (5/50ns), and lightning protection up to 5A (8/20us).

The RS232/485 serial ports are equipped with 3KV isolation. When exposed to long-term high voltages of AC220V or AC380V, only the RS485 interface may be affected, without damaging the USB port or connected devices.

The RS232/485 interfaces provide three-level lightning protection, meeting the GB/T17626.5 (IEC61000-4-5) standard with a short-circuit current wave of 10/700μs and an open-circuit peak output voltage of 6KV with an internal resistance of 40Ω.

Working temperature ranging from -40°C to +85°C.

It has passed 100% burn-in testing.


● Serial Interfaces


EIA/TIA-232 RS-232 (ITU-T V.28)

EIA/TIA-485 RS-485 (ISO/IEC8284)

Serial Port Interfaces:


RS-485: A+, B-, GND

Physical Interface: 5-pin screw terminal with 3.81mm spacing


● USB 2.0 Interface

Standard: USB 2.0

Full-speed: Full-speed (500Kbps to 12Mbps)

Physical Interface: Gold-plated USB Type A male connector


● Environmental Index

Operating Temperature: -40°C to +85°C

Storage Temperature: -40°C to +85°C

Working humidity: 0% – 95% (no condensation)

MTBF: >100,000 hours


Product Model


Function Description

Lightning protection isolated USB to 1 channel RS232/485 converter

Port Description

1 * USB2.0 interface; 1 * RS232 interface, 1 * RS485 interface

Power Supply

Passive, USB powered, power consumption <150mW (5V 30mA)

Product Size

Dimensions: 70mm(L) x 26mm(W) x 14mm(H)




application of usb to 232/485


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